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Aiming at the positioning accuracy control problem in the running of the assembly machine for assembled camshaft, a kind of position controller based on the feedforward‐feedback control of speed and acceleration is designed.

It combines feedforward‐feedback control with the quartic displacement curve acceleration/deceleration algorithm.

The axial dimension and the phase angle of the cam obtained after being assembled is checked. The result shows that for each type of camshaft, the error of the axial dimension of the cam is less than ±0.2mm and the error of the phase angle of the cam is less than ±30′. In addition, production efficiency is greatly improved (the assembling time is 90‐120S/piece).

The paper combines feedforward‐feedback control with the quartic displacement curve acceleration/deceleration algorithm for the first time.

Before the 2007 financial crisis, securitized products accounted for half the credit market. Once regarded as one of the biggest financial innovations of the last century, securitization is now viewed as a contributory factor to the crisis. Until recently research has focused on the post-1970s mortgage securitization market. In this paper, I trace the earlier origins of securitization, from the 12th century Genoese compera through to early 20th century efforts. The historical examples highlight unifying themes on risk allocation and complexity. As the future securitization market remains uncertain, it is important to consider lessons to be learned from these historical episodes.

This is primarily a survey article that utilizes historical documents to compare/contrast features of securitization with the recent crisis.

Improved disclosure is the key element to address recent securitization flaws, but disclosure does not really matter if the entire process is not understood. An examination of historical episodes can be instructive. Forging ahead, any securitization reform needs to address why securitization markets formed, why they failed and how the securitization market can be improved.

As the future securitization market remains uncertain, it is important to consider lessons to be learned from these historical episodes.

To the best of my knowledge, this is one of the first research papers that surveys the history of securitization as far back as the twelfth century.

The globalization of the world, in addition to obvious advantages, also brings potential problems. According to the authors, the problem is that the crisis phenomena occur simultaneously and in a very similar way in different countries. The emphasis on comparing the economic crises of the early twentieth and twenty-first centuries was caused by common features such as political instability, declining living standards, severe pandemics that swept the world and their consequences (twentieth-century coronavirus and Spanish flu of the twenty-first century). Comparative analysis allows assessing the causes of crises and their consequences. The importance of studying the 2020s crisis is that this crisis has become the most painful since the Global Great Depression in the 1930s.

The novelty is determined in the analysis of the situation of the economic crisis of the 2020s. The materials of the article are of the theoretical value for researchers studying crisis phenomena and anti-crisis measures, government bodies and business representatives.